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Growth of a Sunspot

    Naturevolume 141page1007 (1938) | Download Citation

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    Abstract

    BETWEEN May 22 and 24, a large group of sunspots suddenly appeared near the central meridian and became visible to the naked eye. Measures of area taken from the Greenwich photographs show the following rapid increase in size of the spot group, which began as two or three tiny spots. The areas are corrected for foreshortening and are expressed in millionths of the sun's hemisphere.

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    https://doi.org/10.1038/1411007d0

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